[Bug 1260768] [NEW] Fix the ApplyUpdate() D-Bus API

[Barry Warsaw]

Public bug reported:

Bug #1260712 reports the problem where the D-Bus API for ApplyUpdate()
was changed but system-settings wasn't prepared to handle the change.
During post-mortem discussions, Didier requested that the Rebooting()
signal sent by ApplyUpdate() be changed to return an error message
string instead of a boolean, with the empty string meaning no error.
This bug tracks that request.

** Affects: ubuntu-system-image
     Importance: High
     Assignee: Barry Warsaw (barry)
         Status: Triaged

** Affects: ubuntu-system-settings
     Importance: Undecided
         Status: New

** Affects: system-image (Ubuntu)
     Importance: High
     Assignee: Barry Warsaw (barry)
         Status: Triaged

** Affects: ubuntu-system-settings (Ubuntu)
     Importance: Undecided
         Status: New

** Changed in: system-image (Ubuntu)
     Assignee: (unassigned) => Barry Warsaw (barry)

** Also affects: ubuntu-system-image
   Importance: Undecided
       Status: New

** Changed in: ubuntu-system-image
       Status: New => Triaged

** Changed in: ubuntu-system-image
   Importance: Undecided => High

** Changed in: ubuntu-system-image
     Assignee: (unassigned) => Barry Warsaw (barry)

** Changed in: ubuntu-system-image
    Milestone: None => 2.1

** Also affects: ubuntu-system-settings
   Importance: Undecided
       Status: New

** Also affects: ubuntu-system-settings (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1260768

Title:
  Fix the ApplyUpdate() D-Bus API

Status in Ubuntu system image (server/client/updater):
  Triaged
Status in Ubuntu Touch System Settings:
  New
Status in “system-image” package in Ubuntu:
  Triaged
Status in “ubuntu-system-settings” package in Ubuntu:
  New

Bug description:
  Bug #1260712 reports the problem where the D-Bus API for ApplyUpdate()
  was changed but system-settings wasn't prepared to handle the change.
  During post-mortem discussions, Didier requested that the Rebooting()
  signal sent by ApplyUpdate() be changed to return an error message
  string instead of a boolean, with the empty string meaning no error.
  This bug tracks that request.

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